a gigantic catamaran in san francisco bay sailing too close to the wind. the most advanced yacht on earth, worth more than $8 million, capsizing. on these boats that is not even a sail. it's a carbon fiber wing. the sailors, well, they're beefcakes suited up like football players. skipper lured by big money teams with seven-figure salaries and they're flying across open water. >> it tleetss now. it's not guys putting on blazers and sitting on the side with a gin and tonic. >> reporter: i went out as a guest racer on san francisco bay with jimmy, no nonsense aussie and youngest ever america's cup winning skipper. he won it for the u.s. in 2010. >> are there sharks in here? >> yes, there are. >> reporter: these catamarans can fly at 50 miles an hour. it is terrifying. sailing has finally entered the 21st century, fueled by larry ellison's billions and a band of young brash athletes. sailing is now chasing the kind of fans who flocked to nascar. it also flipped during an america's cup world series race here in the bay. >> every man for himself, survival. >> r